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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a91a9cd9d1f571c39e97f824bf7efd76946e8d63cc30bad1ebb071622e9cca' 
  AND token = 'EeN7X44AMAo/g2XBuTNFmQIZ7D4uszqXtwjyhEIswD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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