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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f9fedc1d581ab196a3b78cadccdcb4cf5ddcfe2fe02c62c0097a6308839f7b' 
  AND token = '7YgoPRAkRPr3PCGlT3M13Jn/9hYYSRVQlSXrk1QztUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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