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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd238cc35833bdb5c14831122a6c6022af8edef1e7260aa657ae05e15eb1ca377' 
  AND token = 'Y9NG4CNDUrhxt7TUxZpwLieZ0zSwSo4XrUWfBf3Q5BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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