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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8070e9fea3ba836fc81193d01d43c0effdd9e413691190b9e6dc16f90b0c67ae' 
  AND token = 'z0lN/WtvS0vnd3YmkaALMce0JXyJz4dB9R3bw0+vTQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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