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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf0f6d3658d1694d7cffe74a1ef11fe5fb8e9ba16b5264be7f1546191b5d3dc' 
  AND token = 'b21Ae6Xjt1bWHPBnxDswJxMC7zO794gFNWM7KLeH59k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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