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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b8363cc4f74b1947cb77ae7be385ad336e4cd2c072f0d4d305246194746ee9f' 
  AND token = 'vf2rvWKlIX7HSEjEmeC4OPKOpzJQzB743rHPJeGfh1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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