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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a349b34702f963ee9e0cc8e035040f131b9a1b05f01ad07e6a1836c148767a9' 
  AND token = 'q/i2+xBO4RrWtl3udfgE9Xn1rcltn6Ai17jT1HDY/6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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