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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d570531886f4efe7ca58d76904a331ba5a06fd43659f175e86ea4b5cf7f7e7' 
  AND token = 'if3dqAUEP7PGcnJXbR/ZAvAsHgnWqHk7xn23KFE/7KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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