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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0ed9b4a4cf2a881e7ebeb4607a4ac2f3d544be18d7a4ef50b59ff8daf19db0' 
  AND token = 'sPVZ6J+ZFqv2qNkP8d5CpjLPcpJm6g/gdrvTaCgR7BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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