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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2914af2b71672481880f111c8ae4cb011ff4567354b1043def44fc3588ed1b5' 
  AND token = 'TmNYFNn6C0HDwkotP6f0Q1RWr+GkHAELrLYhZ8uGe0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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