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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab97febb7d0f6451cf43b7fdc6193cd4d6a3c5d0467f27262ce70f446a041246' 
  AND token = 'Rl3y3OFWDpTxNUSWWgoKKZBwQJWM3Lq7Kihedsa+4f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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