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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998ada7afe6fea084cfee379f34b33eefcd074601812248210f08d6812372eca' 
  AND token = 'QIjcMiyG5CVqP1wKKz1WKiY9ygYDAlKU0g52gNp1tV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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