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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4658aa16607828c2b3b70715671bb44784969e99c689388cc2c58b8a3ec6b13' 
  AND token = 'pTw2vpU/1YKgMzFbeZNli6gx89JLx1+u9OrUy4jd3YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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