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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdffc7511e7f901f1d959c24a1cfefee9ffc3eba26d59bf0c1902e6ac98a2ac9' 
  AND token = '7yutD+YeJ/q9MbD/+CwtGIxChx01/5LTZ3pckhyYvMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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