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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95afd852c54ce50a473c96efd8217ab7804a13841ec1921d133e29736c7d020a' 
  AND token = 'ui1S0S3PForrcwz9teDzKoPe1Wxz1n1ysiPLzth/9p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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