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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fcddde07ecc29bb4433e4e9d99b877711b54b3f75ceb4cf3518a7c07e704ae8' 
  AND token = 'm6ejt8iItIb3hc7ymCrMgGN422KljE9980xO71jtvuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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