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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3897d63c5918d664d7808dcfa2b06d1742ed0db87ffd9c33f294440850606738' 
  AND token = '/k4R4a7qF0We+W1ythZAwkRZmkpTYB7Gb3LPT52oTOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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