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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126092c6f527a0caca45e211d3e8def607beaac40860a3d6f6fe7e1009b62727' 
  AND token = 'N5BDqAyO7DRUSsOECZXCix7w0Mb3FsPEzP7WptVidcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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