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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5485ccfc9aa5856d81029d05ec98372f6c04ae27e7f257d0fce936166d7944' 
  AND token = 'Ol9i1X56FTl2ZhgblYF3ksvdbQN6WuYPJkT7bKq9qEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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