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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e6e448fd00ddf43d595e9e5f3e581f00a2d7ce5d56957fc1df8acfa5326fd09' 
  AND token = 'd3sn9p63hHP4y7nUjFlh29KTwUeKYdcjyURrc/M13wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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