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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15cf4996b6eaa9f20f29e8f6284d45dc735926dc840c025cccdd5f19d83a2ae7' 
  AND token = '7OCQsreBGrhE0WkrLTH9Hmf2u+SPVO3OxeCoHOkwuOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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