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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d1fc7b99e5175347f97c2c2b6ecdd6faada2df3822b2fb7727e0b757d7f62e3' 
  AND token = 'Hxz9EskNsL7Rsy5mwgXqCyvnzBsvYKUGSDy0p0KRDk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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