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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d841ba81a7af8d69b5dca4c9be88be57b7b4ec7a0aeed60d86acfa88128564' 
  AND token = 'BsPSVUCD4jBucnSkw1f0nZYS2GpiBaB0MeFl0J/s06E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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