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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0833969d237fab7c51d8879321e0da37e6d0115a9c162f0717edec4a582273' 
  AND token = 'Q6+OcgaWD8R/UQMfeY72jPvjo12oGl9dQGqAhXjo+Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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