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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e9f4d04193bd14e5e44050f25450f9b73060a682c40069a96e9c5d2643d39b' 
  AND token = 'sN7S1h0qOdBGCdEawQC+W06crZJsqfY4DfwU29g8i1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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