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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa016a54dce2e0abed75637bc80fd5171a1a7ad53f4c548889b7e16c15e4b2cc' 
  AND token = '69ECawEYRR/aw97da8J6kPw0Tg/+f+mfVe8nzC0uzbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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