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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634d0e1449214b6c67af67e5a7140f94dbc4a21c9c137f6349db8c70e14c056d' 
  AND token = 'iDGfTrzaxvEPRvrzAF9kCq627rz7u1DIVa8HjBMzdao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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