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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63800e8f4396ad7ff68c76d42a389491b82f6bd8dae0d5919a8c784e29d06dfc' 
  AND token = 'CXkbhbh11ISQ6T8ZXxwDwdP0FFK+n8Gh4mVrZEgGTII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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