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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7ec48203420a07bae0a29c410e033a15e330a7f9e27c42f4ec8e220900273b' 
  AND token = 'kaatDvYXGjEH9oA0LaB66S9zuHAr/0wlvmr8pQsjeyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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