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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9ba1aec73d15de204978816f63121058a7e457da3894d3a249e0dda954f398' 
  AND token = 'P9gih4/P0md2rQ1Y8Rj1rP+DEZ6VUWWsKjpjJfagF74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}