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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8816667caad34bb9f3dde02d637c4aa4e6c0c382cf744b4c9f7b410a21f5eb70' 
  AND token = 'zsVcS9Y47PmwQyA3UuX3Lj7sVCgE/rwit3B6M4aRLJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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