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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec61b11faf0b5ff9073828e9e75a9b32660d4908b0abc1fe41da20764f8ce704' 
  AND token = 'gKhuS+OydVO+TuNp7hNBE3jk+W7ppgDsdApvWxDgSqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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