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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b5253dc074242414efa8b035d935b7c48aa63e3f802ffa46294a3efb5a2954' 
  AND token = '2P9tdykpz5Hs66f6Tip9mJRHVbsREuX3yDoxqcnT3VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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