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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c7a303739ba314501225240f642837a667864ae1b78be65e56757028c7da82' 
  AND token = 'TyQCM61OklTytv7PlUBo6xWGwmYjHt1KE03eKdFe6OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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