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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7457c9bb1eb18dca7715f74989684f45f883a0d5b2e0a911a09817d9847d88c7' 
  AND token = '3auFfIY1nxFpM/5FMXlQ68XYmC0a55f/SCVnrHgc7vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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