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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f5b6f665e52c768b73b62447481e03ef77e7eb4b65262461f6d6703e3aed34' 
  AND token = 'xAdqqPrllRvmf26tFK9u0lemKF6+3vo73+sTCVPUmRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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