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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f48842c53e4916e24204c1de0e32bd80688cd4393d2e335cbb6cbe2a7eb0ac38' 
  AND token = 'oil5rb+ZnOK5Zwv3/LLqskW/MCgtSOSeP7MRl3M8Q2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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