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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47044f1143d4a2b0630f8e8ad0a5cad79d963d56399b5c5a3b395fe38245891' 
  AND token = 'nxNOnVyUXlQnZ211M0zSIhnsqZSyKYu5MfpKPRSKcCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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