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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '254ec01de828e8b4eb97ab0176730b5d648f0b561b6cb1f03918e6472e23f8aa' 
  AND token = 'JeGlInvdgLiIkNLH0RAzHg/wgTyKMxz+JS+NpOnTxe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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