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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ea4cdcbd93a54cc18015296e76f2f77ddc23c0dfae8dcb897ebd7f6fec444e' 
  AND token = 'MtMG0CJwbfUW0l3Yzu0pc/QYW4VW9Ofx8G8S4IM7UYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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