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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04ad0754c0c65c20fd825caa7a74eca041ed6c946ca3630a85d2758339e4808' 
  AND token = 'JTepgWw1hgFxfYU3qMHD6F62DSeo0e8JuZrRdRV8ehU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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