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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ffca8a8b01af70caf29f1b96d4e4869c5d92a478ab498b1b970572386a2fad' 
  AND token = 'Cp1GvwhhG8SfZKKT6BngUmiEaDxSLrD3bq8pb2w5fxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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