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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '389e381d6c2a3df9423be8965a5de60706e48e63459a0546a2d6b35cbfbe4397' 
  AND token = '0Clv2Fc2Xh3jmvtNTekcaWvOQr6VEwfCKCJOiKx2giM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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