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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7485b6b14aa180b124ceba4ae01df2a4fea4b42d9b7c3585fe0b5b95ddc0c20e' 
  AND token = 'yjHTo6MGyaCHXehErIxHXrPCtqRDQqN6is0YDIXAZ3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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