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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62463bbff22f5160c9f44be13fc00c0bafd525ee4b9e0671352fbdf580272bed' 
  AND token = '2suvuQvR4fHtdrtxB9jD625OZsf2sC9d9SHd5W2+cic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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